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ABC is a straight line.




The length AB is five times the length BC .

AC =90 cm.


Work out the length AB .


(3 marks)

ABC is a straight lineThe length AB is five times the length BC AC 90 cmWork out the length AB 3 marks class=

Respuesta :

mhanifa

Answer:

  • 75 cm

Step-by-step explanation:

According to segment addition postulate we have:

  • AC = AB + BC

We are given:

  • AB = 5 BC

Then substitute values into the first equation:

  • AC = 5 BC + BC
  • 90 = 6 BC
  • BC = 90/6 = 15 cm

Find the length of AB:

  • AB = 5*15 cm = 75 cm

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